Basically you need to run this docker compose file from below and enable "Wyoming" integration in HA (I think it'll detect piper & whisper and propose it automatically). Don't worry about picking model too much - you can change it later in HA UI.

  version: "3"
  services:
  ## wyoming
    whisper:
      container_name: whisper
      image: rhasspy/wyoming-whisper
      command: --model base-int8 --language en
      volumes:
        - ./whisper-data:/data
      environment:
        - TZ=Europe/Brussels
      restart: unless-stopped
      ports:
        - 10300:10300

    piper:
      container_name: piper
      image: rhasspy/wyoming-piper
      command: --voice fr-siwis-medium
      volumes:
        - ./piper-data:/data
      environment:
        - TZ=Europe/Brussels
      restart: unless-stopped
      ports:
        - 10200:10200